Investigators arrested 18-year-old Leonard F. Jourdan III Monday night. They said Jourdan made threats to "shoot up" the school and kill a teacher.

No violence actually took place and a news release from the sheriff's office gave no indication that a weapon was brought on campus.

Plaquemines Parish Sheriff Lonnie Greco said Jourdan and his parents came in for an interview when contacted by authorities, and that Jourdan admitted that he made the remarks because he "believes the world is coming to an end."

Officials said Jourdan threatened to tie-up a teacher and slit the teacher's wrists, but then said that remark was made in jest.

A Mexican photojournalist who left the state he worked in because of threats was among five people found shot to death in a Mexico City apartment this weekend, officials and press freedom advocacy groups said.